Zobrazeno 1 - 10
of 14
pro vyhledávání: '"Takashi Gemma"'
Publikováno v:
Applied Optics. 59:9159
We propose a model-based fringe analysis technique that enables the Fourier transform method to analyze dense fringe patterns with large phase variations. The conventional Fourier-transform method has a limited dynamic range of measurable phase becau
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6045c580e49a96670889f4c2467dc858
https://doi.org/10.1364/ao.402415
https://doi.org/10.1364/ao.402415
Autor:
Hidemitsu Toba, Zhiqiang Liu, Saori Udagawa, Naoki Fujiwara, Shigeru Nakayama, Takashi Gemma, Mitsuo Takeda
Publikováno v:
Optical Engineering; Aug2019, Vol. 58 Issue 8, p1-6, 6p
Publikováno v:
SPIE Proceedings.
Phase profiles obtained by phase shifting interferometry often include undesirable concentric ripple-noises, like "bull's-eye patterns" which are caused by scattering from defects on surfaces of optical elements in interferometers. We propose a numer
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d90e6626828742fc070fb09cb56e4a5c
https://doi.org/10.1117/12.888918
https://doi.org/10.1117/12.888918
Autor:
Mitsuo Takeda, Naoki Fujiwara, Saori Udagawa, Shigeru Nakayama, Hidemitsu Toba, Takashi Gemma, Zhiqiang Liu
Publikováno v:
SPIE Proceedings.
We propose a method for reducing artifactual phase errors inherent to the Fourier transform method (FTM) for fringe analysis. The phase obtained by the FTM is subject to ripple errors at the boundary edges of the fringe pattern where fringes become d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2fc96851ccc7c3cbe4a70098284df46e
https://doi.org/10.1117/12.825200
https://doi.org/10.1117/12.825200
Autor:
Takashi Gemma
Publikováno v:
Journal of the Japan Society for Precision Engineering. 56:1791-1795
HI-2の仕様一覧表を表1に示す.CGHを用いた干渉法は,波面の変換機能というホログラムの特徴を用いた測定法である.原理自体はよく知られていたこの方法が,近年再び脚光を浴びている理由
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1cd899db6f1496ae4e5544aa19fe501b
https://doi.org/10.2493/jjspe.56.1791
https://doi.org/10.2493/jjspe.56.1791
Autor:
Tetsuji Onuki, Takahiro Yamamoto, Hajime Ichikawa, Takashi Gemma, T. Umeda, Fukuda Yusuke, Shigeru Nakayama
Publikováno v:
Initiatives of Precision Engineering at the Beginning of a Millennium ISBN: 0792374142
This paper describes null interferometry at 1nm accuracy for testing aspherical surfaces of sub-mm deviation from the best fitting sphere. We have developed the two kinds of null compensators. The one was the null lens composed of almost “perfect
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c291f01ed9938ecc7d72730fe6750e27
https://doi.org/10.1007/0-306-47000-4_133
https://doi.org/10.1007/0-306-47000-4_133
Autor:
Takashi Gemma, Katsuhiko Murakami, Yucong Zhu, Shigeru Nakayama, Katsura Otaki, Mikihiko Ishii
Publikováno v:
SPIE Proceedings.
In visible-light point diffraction interferometer (PDI), in order to achieve measurement error
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5854d8b39728c43d15f80aa389eb1a9c
https://doi.org/10.1117/12.507046
https://doi.org/10.1117/12.507046
Autor:
Tetsuji Onuki, Takahiro Yamamoto, Fukuda Yusuke, Toshiro Umeda, Shigeru Nakayama, Yuichi Takigawa, Hajime Ichikawa, Takashi Gemma
Publikováno v:
Optical Fabrication and Testing.
This paper describes null interferometry at 1nm accuracy for testing aspherical surfaces of sub-mm deviation from the best fitting sphere. We have developed the two kinds of null compensators. The one is a “null lens” composed of almost perfect s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::218b8b0b851a7ea30ad9e5194ab5144c
https://doi.org/10.1364/oft.2002.owd4
https://doi.org/10.1364/oft.2002.owd4
Publikováno v:
Applied Optics. 49:D12
An improved illumination system is proposed for creating a temporally coherent and spatially incoherent extended source to be used for spatial coherence control and reconstruction of a coherent hologram. Taking into account the fact that a rotating g
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::07352e26adaf634724bc57955a138497
https://doi.org/10.1364/ao.49.000d12
https://doi.org/10.1364/ao.49.000d12
Publikováno v:
Optical Testing and Metrology III: Recent Advances in Industrial Optical Inspection.
This paper describes an interferometer system for testing aspheric surfaces with computer-generated holograms (CGHs). A CGH written by electron-beams achieves the precise testing of a wide range of aspheric surfaces. A new algorithm removes the error
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d296d4986412e8dc745055f8a5be1e0e
https://doi.org/10.1117/12.51053
https://doi.org/10.1117/12.51053